JURA J90 LEAK – CAUSED BY BACK FLOW FROM A BLOCKED HEAT EXCHANGER

Why am I telling you this. Because I may save you from purchasing a new Heat Exchanger and Ceramic Valve, both bloody expensive items.
This machine was leaking badly from the ceramic valve area, but on closer inspection it was obvious the Ceramic Valve was not split. What had in fact happened was the silicon hose that connects the Ceramic Valve to the Heat Exchanger had blown partially off, caused by back pressure when steam was being vented. Why back pressure? because the heat exchanger was blocked by scale.

The Heat Exchanger functions to firstly, I assume dissipate some heat from the steam being vented (dumped) and secondly to preheat the water going into the main pump. Yep there water inlet tube runs via the Heat Exchanger in these machines.

I recommended you remove and descale your heat exchanger as they always scale up and you really want to avoid damage to the Heat Exchanger and the Ceramic Valve.

If its too late, yes we do sell the Jura Heat Exchangers here.

jura heat exchanger
Jura Heat Exchanger partially removed
Jura Heat Exchanger with lid removed showing scale build up.

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